U.S. Marine Corps War Dogs and the men who are being trained with them are put through close order drill to get them used to discipline. Credit: U.S. Marine Corps

Dogs are wrapped inside a coverall blouse and lowered from the side of the ship in landing operations. Credit: U.S. Marine Corps

Private First Class Homer J. Finley, Jr., USMC, is shown with his canine leatherneck buddy, Jan, spotting a make-believe sniper in a tree during the day's rugged training period. Credit: U.S. Marine Corps

Rex, a 2-year-old Doberman Pinscher, is shown here with his trainers, Private First Class William N. Hendrickson and Private Charles Foist. Rex was officially commended for saving the lives of many Marines by warning of the proximity of Japanese forces. Credit: Official Marine Corps Photograph

The entrance to the new kennels at Camp Lejeune in North Carolina, where canine Marines are put through their boot camp. Credit: U.S. Marine Corps

Dino, a Weimaraner. Credit unknown.

Private Alexander A. Boccardo, USMC, is shown with his fighting partner, who is learning how to bear his fangs at the Marine War Dog Detachment Training School. Credit: U.S. Marine Corps

Devil Dogs rush out of a landing barge on a practice landing. Credit: U.S. Marine Corps

1942. Soldiers and coast guardsmen who are training the first group of dogs actually inducted into the U.S. Army for duty as messengers, sentries, and other duties are shown grooming their charges atop the kennels at Front Royal, Virginia. Credit: International News Photos

Devile Dogs during a practice landing. Credit: U.S. Marine Corps

Private Michael DiPoi, USMCR, and his canine companion charge through the "smoke of battle." Credit: U.S. Marine Corps